| 发明名称 |
Illumination optical system for an endoscope |
| 摘要 |
An illumination optical system for an endoscope comprising a light source, and a lens system arranged on the object side of said light source and having at least one aspherical surface, said illumination optical system being so designed as to satisfy the following conditions (1) through (3): (1) Height of ray h satisfying d/dh {sin A(h)}<0 exists within a range of 0</=h</=r. (2) A relation of sin A(ho)>/=0.3 establishes for a certain value ho of h within a range of 0<ho<r satisfying d/dh {sin A(Ho)}=0 (3) S<0.5 So This illumination optical system has a wide illumination range and provides favorable light distribution at marginal portion with little loss of light quantity.
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| 申请公布号 |
US4952040(A) |
申请公布日期 |
1990.08.28 |
| 申请号 |
US19890324974 |
申请日期 |
1989.03.20 |
| 申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
IGARASHI, TSUTOMU |
| 分类号 |
G02B13/18;A61B1/00;G02B3/04;G02B23/24;G02B23/26 |
主分类号 |
G02B13/18 |
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